The ‘Backrooms’ monster torments Clark (Chiwetel Ejiofor) and Dr. Mary Kline (Renate Reinsve), alongside other mysteries—here’s what it all means.

“Backrooms,” director Kane Parsons’ horror thriller based on his hit YouTube web series, is new in theaters this weekend and is winning over most Rotten Tomatoes critics.

‘Backrooms’ shows the descent of Clark (Chiwetel Ejiofor) into the nightmarish otherworld— but what does the ending mean?